diff --git a/test/138-duplicate-classes-check/src/Main.java b/test/138-duplicate-classes-check/src/Main.java
index a2ef281..5ffceb9 100644
--- a/test/138-duplicate-classes-check/src/Main.java
+++ b/test/138-duplicate-classes-check/src/Main.java
@@ -38,7 +38,7 @@
                 getClass().getClassLoader());
 
         try {
-            Class testEx = loader.loadClass("TestEx");
+            Class<?> testEx = loader.loadClass("TestEx");
             Method test = testEx.getDeclaredMethod("test");
             test.invoke(null);
         } catch (Exception exc) {